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相关概念视频

Ionic Radii03:10

Ionic Radii

33.9K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.9K
Ionic Bonds00:42

Ionic Bonds

132.2K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
132.2K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
49.8K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.3K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.9K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.9K

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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定义序列的离子块共聚物的溶液自组件

Garrett L Sternhagen1, Sudipta Gupta1, Yueheng Zhang2

  • 1Department of Chemistry and Macromolecular Studies Group , Louisiana State University , Baton Rouge , Louisiana 70803 , United States.

Journal of the American Chemical Society
|March 7, 2018
PubMed
概括
此摘要是机器生成的。

离子块共聚物自组成可调的球状. 控制离子单体的位置精确地决定了细胞的大小和聚合,为设计纳米结构提供了新的方法.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 纳米技术

背景情况:

  • 两块共聚物自组成.
  • 控制细胞结构对于应用至关重要.
  • 离子单体引入电荷,影响自我组装.

研究的目的:

  • 合成和描述离子块共聚物.
  • 研究离子单体数量和位置对细胞结构的影响.
  • 为量身定制的菌形成建立结构属性关系.

主要方法:

  • 区块共聚物的亚单体合成.
  • 控制pH的水溶和自组合.
  • 用于结构分析的小角度中子散射 (SANS).

主要成果:

  • 有控制的离子含量和位置的合成块共聚物.
  • 观察到自组成球状小粒 (5-10纳米半径) 具有较低的临界小粒度 (CMC).
  • 发现微粒聚合数和半径随着离子单体距离结点的增加而增加,遵循功率定律关系.

结论:

  • 精确控制块共聚物中的离子单体位置,可以微调粒大小和聚合.
  • 展示了具有特定性质的工程纳米结构的方法.
  • 结果与充电聚合物的理论模型相一致.